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| Titel |
MEDUSA-2.0: an intermediate complexity biogeochemical model of the marine carbon cycle for climate change and ocean acidification studies |
| VerfasserIn |
A. Yool, E. E. Popova, T. R. Anderson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 5 ; Nr. 6, no. 5 (2013-10-29), S.1767-1811 |
| Datensatznummer |
250085006
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| Publikation (Nr.) |
 copernicus.org/gmd-6-1767-2013.pdf |
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| Zusammenfassung |
| MEDUSA-1.0 (Model of Ecosystem
Dynamics, nutrient Utilisation, Sequestration and
Acidification) was developed as an "intermediate complexity"
plankton ecosystem model to study the biogeochemical response, and especially
that of the so-called "biological pump", to anthropogenically driven change
in the World Ocean (Yool et al.,
2011). The base currency in this model was
nitrogen from which fluxes of organic carbon, including export to the deep
ocean, were calculated by invoking fixed C:N ratios in
phytoplankton, zooplankton and detritus. However, due to anthropogenic activity, the atmospheric concentration
of carbon dioxide (CO2) has significantly increased above its
natural, inter-glacial background. As such, simulating and predicting
the carbon cycle in the ocean in its entirety, including ventilation
of CO2 with the atmosphere and the resulting impact of ocean
acidification on marine ecosystems, requires that both organic and
inorganic carbon be afforded a more complete representation in the
model specification. Here, we introduce
MEDUSA-2.0, an expanded successor model which includes
additional state variables for dissolved inorganic carbon, alkalinity,
dissolved oxygen and detritus carbon (permitting variable C:N in
exported organic matter), as well as a simple benthic formulation and
extended parameterizations of phytoplankton growth, calcification and
detritus remineralisation. A full description of
MEDUSA-2.0, including its additional functionality, is
provided and a multi-decadal spin-up simulation (1860–2005) is performed.
The biogeochemical performance of the model is evaluated using a diverse
range of observational data, and MEDUSA-2.0 is assessed
relative to comparable models using output from the Coupled Model
Intercomparison Project (CMIP5). |
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